Gear-cutting machine.



T. PAWCUS & A. F. 000KB.

GEAR CUTTING MACHINE. APPLIOA'I'IONIILBD MAY 23; 1909.

Patented Ja11.3,191 1.

.4 SHEETS-SHEET 1.

INVENTOR$ a MS (1! GA wnnassss T. FAWCUS &A. F. 000KB.

GEAR CUTTING MACHINE. APPQICATION IILEDMAYJS, 1909.

Patented J an. 3, 1911.

INVENTORS WITNESSES T. FAWGUS'& A. F. 000KB.

GEAR GUTTl-NG MAGHINB. APPLICATION FILED MA'Y is, 1909.

Patent ed Jan, 3 1911;

mvp'Nrro as WITNESSES .T. PAWGUS & A. P. GOOKE.

v GEAR CUTTING MACHINE. APPLICATION FILED MAY 28', 1909. 98,232n

4 sums-sum 4.

'nates a wheel pit 4, upon which the m THGMAS FA'WCUS, OF PITTSBURG,AND1ALFRED F.

an eerie COOKE, OF EDGEWOOD PARK,

' PENNSYLVANIA.

GEAR-CUTTING MACH INE.

Specification of Letters Patent. Application filed May 28, 1909. SerialNo. 489,009.

Patented Jan. 3, 1911.

To all whom it may concern.

Be it known that we, THOMAS F AwoUs, of Pittsburg, and ALFRED F. CooKE,of Edge wood Park, both in the county of Allegheny and State oflennsylwrnia, have invented a new and useful which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, specification, in which Figure 1 is a machineembodying our invention; Fig. A is an end elevation of the same; Fig.3is a de tail sectional view of the clutch mechanism; F 4 and 5 aredetail views of the driving gear; F ig. (S is a detail perspective viewof one of the clutch-shifting members; Fig. 7 is a detail sectional Viewshowing the gearing for actuating the tool saddle; and Figs. 8 and 9 aredetail views showing the mechanism for operating the index wheel.

Our invention has relation to gear-cutting machines and has been moreespecially designed to provide a machine for cutting spur teeth on gearwheels of relatively large diameters, wide faces and coarse pitches,although the machine may also be used for cutting teeth on gear wheelsof smaller diameters.

Our invention provides a. machine by means 'of which gear wheels oflarge diameters, and which have heretoforepresented many difficulties inproperly cutting, may be conveniently and accurately cut.

The precise nature of our invention will be best understood by referenceto the accompanying drawings, in which we have shown the preferred formof our invention, and which will now be described, it being premised,however, that various ch'angesmay be made in the details of constructionand ari-angemcnt of the parts by those skilled in the art, withoutdeparting from the spirit and scope of our in vcntion as defined in theappended claims.

In these drawin gs, the numeral 2 desigpreferably having conover whichthe machine is placed. Extending along the longitudinal upper edges ofthe pit are two rails or ways achine is mounted.

5 designates pillow blocks which are adcrete walls 3, and

plan view of a gear-cutting Gear-Cutting Machine, of L a forming part ofthis in which are mounted in wheel shaft 6.

is the indexing wheel which is mounted upon oneend of the shaft 6, "saidsha fthaving a separable joint atS to facilitate placing the thecutgears therefrom. 9 designates the cross rail or main slide which isadjustably mounted upon ways or rails'4 and which carries a drivingmecha- 'nism and the cutting tool a anisms. 10 designates the toolsaddle, which is mounted on the cross rail or main slide 9. This saddlecarries a main horizontal slide .11, which hasits motionin a directionparallel to the length of the ways or rails at, and also a fixed bracket12, which forms the suport for the gear former or pattern. Theiiorizontal slide 11 carries the two vertical slides 13 and 14, thefront slide 14: carrying the tool block 15. The rear slide 13 carriesthe former rider pin 16, which engages the former or tcmplct 17,supported by the bracket 12. The slide 14 has a vertical adjustment onthe slide 13', but has no direct connection with the rider pin. Itcan,,l1owever, be rigidly locked to the slide 13, the purpose of theseparate slide 14- be'ing to facilitate the setting of the tool for thevari ous cuts. After the setting has. once been made, the two slides arebolted tiogether rigidly and move in unison. This cutting mechanism is,however, of well known charthe work and indexacter and forms no part ofour present in-' vention.

On one portion of the cross rail or main slide 9. is mounted an electricmotor 18,

justably secured to the rails or ways 4, and

gear blanks thereon and removing nd feeding mechhas an extended a1'-' anintermediate idler pinion 27. The pin- "'Slidably 'veifsing.

ion 22 and gear wheel 24 are for the drive or cutting stroke of thetool, While the pin ions 23 and 27 and the gear wheel 26 are for thespeeded reverse, the speed ratio in the machine shown beingapproximately 2 to mounted on the shaft 25, between the two gears 24;and 26, is a clutch disk 28, having on one face a friction ring 29,adapt ed to engage the frictional inner surface 30 of the'gear wheel 24,and having on its other face a similar but smaller diameter frictionring '31, which is arranged to engage the inner frictional face 32 ofthe spur gear wheel 26. This clutch member is shifted alternately intoand out of driving engagement with the respective wheels 24: and 2G bymeans of an endwise movable rod 3 which is slidably mounted in thehollow end of the shaft 25, and has a key 34 which ex-- tends through aslot in the shaft 2:) into engagement with the hub of the clutch member.The shaft. 25 is extended backward under the tool saddle and carries aworm 36 which engages a worm .wheel 37 on a cross shaft 38 (see Fig. 7)This cross shaft. has two spur gears 39, which mesh with straight racks40, on the under side of the saddle, these racks being spaced near theedges of the saddle in order todo'away with any tendency to cramp ortwist when the saddle is in motion. Secured to the front "of the saddleis a depending arm 41, which.

projects downwardly and fits over a long shi ping rod 42, which issupported in brackets or lugs 43"0n the cross rail 9', and which isprovided with adjustable springcushioncd'stops 44: and 45. Connected toone end of the shipping rod 42 is a lever 46, fulcrumed at 47 and havingits shorter arm in the form of a toothed segment 48, whose, teeth meshwit the teeth of a similar seganent 419, on a lever 50, which isfnlcrumed at 5]. andconnected at 51 to the head of the clutch-shiftingrod 33, before described. As the tool saddle moves forward and backward,the depending arm 41 operates the shipping rod through the stops 4% and45, and this rod, in turn, operates the clutch-v shifting rod 33 1through the toothed segments and levers, just described. The lever 50 isprovided at its upper end with a dashpot attachment-52, to preventshocks in re- Saidlever also carries an antifriction roller 53, which isarranged to bear against the cone-shaped head of a springseated pin 54,which is mounted in the end of the cross rail, as shown in Fig. 8. Asthe lever 50 is moved past its center, the roller 53' moves over thecone point of the pin 54, and the spring of said pin immediately teethfrom the former or 'tool saddle and tool slides,

throws it up at the opposite side of the roller, thereby gi ing a quickreverse movement. 1

The power feed foipthe cutting tool is obtained by the gears and 56 (seeFig. 2i the gear 56 having an arm 57 which swings between two*adprstably fixed collars 58, secured to a bar 58 on the cross rail orslide 5). This feed'is of a well known character and fo'rn'is no part ofthe present invention. lt therefore not described or shown in detail. 1

The index wheel 7 has a worm gear on its periphery and is operated bymeans of a worm 59, geared to a shaft (30. This shaft (50 extends to thefront of the machine and is provided at its front end with an indexingplate (31, having a single periphcralnotch (32, which is engaged by astop pin (33, operated by a lever (34. For the purpose ofoperatingthein'dex wheel, I have shown a small electric motor (35 (see Figs. 8and 9) whose shaft ($6 is connected through worm gear (57 with avertical shaft G8, l1a mg a worm (itl'engaging a worm wheel on the indexwheel-operating shaft (30. In operation, the depression of the lever (3L releases the pin ()2 from its engagement with the notch of the indexplate 60, and the motor '65 is then iperated to give the plate 61 andthe shaft 0 the desired number of revolutions.

It will be understood that the action of the slide which carries thecutting wheel is essentially the same as the action of a shaper ram. A.single pointed cutting tool is.nsed and generates the pro-files of thetemplet, being in this respect similar to well known gear-. planingmachines.

The cross rail or machine slide 9 can be moved on theways or rails, 4,to any desired distance from the work-carrying and indexing shaft (3, toaccon'unodate gear blanks of different diameters, and it will also beobvious that, if "desired, other separate pillow blocks can be mountedupon the ways or rails intermediate the pillow blocks 5, and the crossrail 9, when it is desired to cut gear wheels of, relatively smalldiameters. It will also be understood that the pillow blocks may be ofany desired form. Thus, in case of gear wheels which are formedintegrally with their shafts or journals, and can not therefore bemounted upon the shaft (3, special pillow blocks or supports may beprovided therefor.

.The machine above'described is simple imits construction andarrangement of parts and is practically fiinlimited in the size of, gearwheels which can be cut thereon.

It will be obvious that various changes can be made in the details ofconstruction parts. Thus, theand arrangement of the I together with theactuating gear therefor, may be of any well known character, variousforms of clutches and clutch-shifting devices may be employed forcontrolling the actuating gearing, and numerous other changes may bemade.

We claim: A

1. In a gear cutting machine, a wheel pit, ways or rails mounted atopposite sides of the pit, a work-supporting and indexing shaftsupported on the ways or rails, a toolsupport also mounted on said waysor rails, means for moving the tool-support and the index shaftrelatively to each other to vary the distance between them, a motor, anactuating shaft geared to said motor, a reciprocating tool carrierconnected to said shaft, and mechanism for feeding the tool;substantially as described.

cross rail or slide,

2. .In a gear-cutting machine, a wheel pit. ways or rails mounted at theupper edges of the pit at opposite sides thereof, a worksupporting andindexing'shaft supported on the ways or rails,'a cross rail or slidealso supported on said rails, a tool carrier mou1ited on said slide, aconstantly driven motor also mounted on the slide, and reversing gearingconnecting the' -motor with the tool carrier, said reversing gearingbeing mounted on the slide and reversed by the movements of the toolcarrier; substantially as described.

3. In a gear-cutting machine, a movable a tool carrier mounted forreciprocation thereon, a motor also mounted on said slide, andconstantlydriven in one direction, an actuating shaft geared to thetool-carrier, two. sets of reverse gears for connecting said shaft withthe motor shaft, and means controlled by the movement of the toolcarrier for alternately throwing the gears into and out of operation;substantially as described.

In a gear-cutting machine, a movable cross rail or slide, a tool carriermounted for reciprocation thereon, a motor also mounted on said slideand constantly driven in one direction, said motor having its shaftprovided with two driving pinions, an actuating shaft geared to the,toolcarrier and journaled on said slide, two gears of different diametersloosely mounted on said shaft, one of said gears having a directengagement with one-of the pinions I l f l I l I l on the motor shaft,

and the other of said gears having an indirect engagement with the otherpinion on the motor shaft, clutch mechanism for alternately connectingthe two gears of the actuating shaft, and clutch-shifting mechanismcontrolled by the movement of the tool carrier, substantially asdescribed.

5. In a gear cutting machine, a wheel pit, ways or rails mounted at theupper edges of the pitat opposite sides thereof, a worksupporting andindexing shaft supported on the ways or rails, indexing mechanismconnected to said shaft, a tool-support also supported on said ways orrails, means for moving the said shaft and the tool-support relativelyto each other to vary the distance between them, a tool carrier mountedon the support, a driving motor, an actuating shaft geared to said motorand also to the tool carrier, and reversing mechanism controlled by themovement of the tool-carrier; substantially as described.

-6. In a gear-cutting machine, an actuating shaft for the tool carrier,a pair of gear wheels of different diameters loosel mounted onsaid-shaft, a clutch member a apted to connect either one of the gearwheels with the shaft, a clutch-shifting rod mounted for endwisemovement on the shaft, a shipping rod actuated by the movement of thetool carrier, actuating connections between the shipping rod and theclutch-shifting rod, and mechanism for feeding the tool, substantiallyas described.

7. In a gear-cutting machine, a wheel pit, ways or rails mounted uponopposite sides of the wheel pit, a Work-supporting and in dexin'g shaftjournaled on said -ways or rails, a cross rail or slide adj ustablymounted on the Ways or rails, and movable toward and away from saidshaft, a tool-carrier mounted on said slide, a driving motor, andactuating gearing for said carrier also mounted on the slide;substantially as described.

In testimony whereof, we have hereunto set our hands. a

THOS. FAIVCUS. A. F. (,OOKE. Witnesses:

R. A. BALDERSON, H. M. 001mm.

